APUSH Unit 5 Review - The MEXICAN-AMERICAN War & Its PROBLEMS [APUSH Review]

More from Heimler's History: APUSH Video Noteguides: https://resources.heimlershistory.com Tiktok: @steveheimler Instagram: @heimlers_history In this video Heimler walks you through everything you need to know about APUSH Unit 5 Topic 3 (5.3) which is all about the Mexican-American War and its effects, chief among them the addition of enormous amounts of land to the United States and a bitter debate over the expansion of slavery into those lands.